Files
VEFontCache-Odin/vefontcache/misc.odin

210 lines
7.1 KiB
Odin

package vefontcache
/*
Didn't want to splinter this into more files..
Just a bunch of utilities.
*/
import "core:simd"
import core_log "core:log"
peek_array :: #force_inline proc "contextless" ( self : [dynamic]$Type ) -> Type {
return self[ len(self) - 1 ]
}
reload_array :: #force_inline proc( self : ^[dynamic]$Type, allocator : Allocator ) {
raw := transmute( ^Raw_Dynamic_Array) self
raw.allocator = allocator
}
reload_array_soa :: #force_inline proc( self : ^#soa[dynamic]$Type, allocator : Allocator ) {
raw := raw_soa_footer(self)
raw.allocator = allocator
}
reload_map :: #force_inline proc( self : ^map [$KeyType] $EntryType, allocator : Allocator ) {
raw := transmute( ^Raw_Map) self
raw.allocator = allocator
}
to_bytes :: #force_inline proc "contextless" ( typed_data : ^$Type ) -> []byte { return slice_ptr( transmute(^byte) typed_data, size_of(Type) ) }
@(optimization_mode="favor_size")
djb8_hash :: #force_inline proc "contextless" ( hash : ^$Type, bytes : []byte ) { for value in bytes do (hash^) = (( (hash^) << 8) + (hash^) ) + Type(value) }
RGBA8 :: [4]u8
RGBAN :: [4]f32
Vec2 :: [2]f32
Vec2i :: [2]i32
Vec2_64 :: [2]f64
Transform :: struct {
pos : Vec2,
scale : Vec2,
}
Range2 :: struct {
p0, p1 : Vec2,
}
mul_range2_vec2 :: #force_inline proc "contextless" ( range : Range2, v : Vec2 ) -> Range2 { return { range.p0 * v, range.p1 * v } }
size_range2 :: #force_inline proc "contextless" ( range : Range2 ) -> Vec2 { return range.p1 - range.p0 }
vec2_from_scalar :: #force_inline proc "contextless" ( scalar : f32 ) -> Vec2 { return { scalar, scalar }}
vec2_64_from_vec2 :: #force_inline proc "contextless" ( v2 : Vec2 ) -> Vec2_64 { return { f64(v2.x), f64(v2.y) }}
vec2_from_vec2i :: #force_inline proc "contextless" ( v2i : Vec2i ) -> Vec2 { return { f32(v2i.x), f32(v2i.y) }}
vec2i_from_vec2 :: #force_inline proc "contextless" ( v2 : Vec2 ) -> Vec2i { return { i32(v2.x), i32(v2.y) }}
@(require_results) ceil_vec2 :: proc "contextless" ( v : Vec2 ) -> Vec2 { return { ceil_f32(v.x), ceil_f32(v.y) } }
@(require_results) floor_vec2 :: proc "contextless" ( v : Vec2 ) -> Vec2 { return { floor_f32(v.x), floor_f32(v.y) } }
// This buffer is used below excluisvely to prevent any allocator recursion when verbose logging from allocators.
// This means a single line is limited to 4k buffer
// Logger_Allocator_Buffer : [4 * Kilobyte]u8
log :: proc( msg : string, level := core_log.Level.Info, loc := #caller_location ) {
// temp_arena : Arena; arena_init(& temp_arena, Logger_Allocator_Buffer[:])
// context.allocator = arena_allocator(& temp_arena)
// context.temp_allocator = arena_allocator(& temp_arena)
core_log.log( level, msg, location = loc )
}
logf :: proc( fmt : string, args : ..any, level := core_log.Level.Info, loc := #caller_location ) {
// temp_arena : Arena; arena_init(& temp_arena, Logger_Allocator_Buffer[:])
// context.allocator = arena_allocator(& temp_arena)
// context.temp_allocator = arena_allocator(& temp_arena)
core_log.logf( level, fmt, ..args, location = loc )
}
@(optimization_mode="favor_size")
to_glyph_buffer_space :: #force_inline proc "contextless" ( #no_alias position, scale : ^Vec2, size : Vec2 )
{
pos := position^
scale_32 := scale^
quotient : Vec2 = 1.0 / size
pos = pos * quotient * 2.0 - 1.0
scale_32 = scale_32 * quotient * 2.0
(position^) = pos
(scale^) = scale_32
}
@(optimization_mode="favor_size")
to_target_space :: #force_inline proc "contextless" ( #no_alias position, scale : ^Vec2, size : Vec2 )
{
quotient : Vec2 = 1.0 / size
(position^) *= quotient
(scale^) *= quotient
}
USE_MANUAL_SIMD_FOR_BEZIER_OPS :: true
when ! USE_MANUAL_SIMD_FOR_BEZIER_OPS
{
// For a provided alpha value,
// allows the function to calculate the position of a point along the curve at any given fraction of its total length
// ve_fontcache_eval_bezier (quadratic)
eval_point_on_bezier3 :: #force_inline proc "contextless" ( p0, p1, p2 : Vec2, alpha : f32 ) -> Vec2
{
weight_start := (1 - alpha) * (1 - alpha)
weight_control := 2.0 * (1 - alpha) * alpha
weight_end := alpha * alpha
starting_point := p0 * weight_start
control_point := p1 * weight_control
end_point := p2 * weight_end
point := starting_point + control_point + end_point
return { f32(point.x), f32(point.y) }
}
// For a provided alpha value,
// allows the function to calculate the position of a point along the curve at any given fraction of its total length
// ve_fontcache_eval_bezier (cubic)
eval_point_on_bezier4 :: #force_inline proc "contextless" ( p0, p1, p2, p3 : Vec2, alpha : f32 ) -> Vec2
{
weight_start := (1 - alpha) * (1 - alpha) * (1 - alpha)
weight_c_a := 3 * (1 - alpha) * (1 - alpha) * alpha
weight_c_b := 3 * (1 - alpha) * alpha * alpha
weight_end := alpha * alpha * alpha
start_point := p0 * weight_start
control_a := p1 * weight_c_a
control_b := p2 * weight_c_b
end_point := p3 * weight_end
point := start_point + control_a + control_b + end_point
return { f32(point.x), f32(point.y) }
}
}
else
{
Vec2_SIMD :: simd.f32x4
@(optimization_mode="favor_size")
vec2_to_simd :: #force_inline proc "contextless" (v: Vec2) -> Vec2_SIMD {
return Vec2_SIMD{v.x, v.y, 0, 0}
}
@(optimization_mode="favor_size")
simd_to_vec2 :: #force_inline proc "contextless" (v: Vec2_SIMD) -> Vec2 {
return Vec2{ simd.extract(v, 0), simd.extract(v, 1) }
}
@(optimization_mode="favor_size")
eval_point_on_bezier3 :: #force_inline proc "contextless" (p0, p1, p2: Vec2, alpha: f32) -> Vec2
{
simd_p0 := vec2_to_simd(p0)
simd_p1 := vec2_to_simd(p1)
simd_p2 := vec2_to_simd(p2)
one_minus_alpha := 1.0 - alpha
weight_start := one_minus_alpha * one_minus_alpha
weight_control := 2.0 * one_minus_alpha * alpha
weight_end := alpha * alpha
simd_weights := Vec2_SIMD{weight_start, weight_control, weight_end, 0}
result := simd.add(
simd.add(
simd.mul( simd_p0, simd.swizzle( simd_weights, 0, 0, 0, 0) ),
simd.mul( simd_p1, simd.swizzle( simd_weights, 1, 1, 1, 1) )
),
simd.mul( simd_p2, simd.swizzle(simd_weights, 2, 2, 2, 2) )
)
return simd_to_vec2(result)
}
@(optimization_mode="favor_size")
eval_point_on_bezier4 :: #force_inline proc "contextless" (p0, p1, p2, p3: Vec2, alpha: f32) -> Vec2
{
simd_p0 := vec2_to_simd(p0)
simd_p1 := vec2_to_simd(p1)
simd_p2 := vec2_to_simd(p2)
simd_p3 := vec2_to_simd(p3)
one_minus_alpha := 1.0 - alpha
weight_start := one_minus_alpha * one_minus_alpha * one_minus_alpha
weight_c_a := 3 * one_minus_alpha * one_minus_alpha * alpha
weight_c_b := 3 * one_minus_alpha * alpha * alpha
weight_end := alpha * alpha * alpha
simd_weights := Vec2_SIMD { weight_start, weight_c_a, weight_c_b, weight_end }
result := simd.add(
simd.add(
simd.mul( simd_p0, simd.swizzle(simd_weights, 0, 0, 0, 0) ),
simd.mul( simd_p1, simd.swizzle(simd_weights, 1, 1, 1, 1) )
),
simd.add(
simd.mul( simd_p2, simd.swizzle(simd_weights, 2, 2, 2, 2) ),
simd.mul( simd_p3, simd.swizzle(simd_weights, 3, 3, 3, 3) )
)
)
return simd_to_vec2(result)
}
}